Calculate the average acceleration of the shell as it goes from zero to 45.8 m/s

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A 2.3-kg fireworks shell is fired at an angle 12.5° from the vertical from a mortar and reaches a height of 102 m. Take the upwards direction to be positive . m = 2.3 kg h = 102 m l = 0.575 m a = 12.5 ° 

The mortar itself is a tube 0.575 m long.

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